Stereotype-plate holder.



PATENTED OCT. 29, 1907.

J. S. WEYL.

STERBOTYPE PLATE HOLDER.

APPLICATION FILED DBO. 28. 1908.

v WINESSES ATTORNEY.

purposes intended.

JULIUS S. WEYL, OF

PHILADELPHIA, PENNSYLVANIA.

STEREOTYPE-PLATE HOLDER.

Specification of Letters Patent Patented Oct. 29, 1907.

Application filed December 28. 1906 serial No. 349,767"

tion, reference being had to the accompanying drawings, forming a partof this specification.

My invention relates to holders for printing plates, and has for itsobject the improvement. of such devices now in use, in those particularsin which they have been found, in practical use, to be defective orinadequate for the purpose intended Devices-of this class are of thenature of clamps coacting with a diagonally grooved supporting-block,the ultimate result sought being to clamp a printing plate securely onthe supporting block. Such devices are used by printers in making up"forms" for the printing press, and it is es sential, from a practicalstandpoint, that the clamping elements, one of which is hidden fromsight in the groove in the block, should be ofsuch character, as to beguided with certainty into register when sought to be assembled, andalso that the clamping should be so cure against liability, toaccidentally become loose, which can only be effected by means operatingto lock the beveled clamping out to the corresponding shaped walls ofthe groove, when the elements are brought into clamping position rclativel y to the grooved supporting-block and the printing-plate to belixedly held thereon in making up the form.

My improved holder is predicated upon a type of such devices as shown inthe U. St Patent dated No; vember 18, 1900, No. 66l,780 to Ferdinand\vesel, and it is designed to improve such device in those features andmode of operation in which, in practical use by me I have found it to bedefective or inadequate for the The supportingblock having a series ofparallel dovetailed grooves, extending diagonally from edge to edge ofthe block, with nuts adapted to rest in the grooves and complementalscrews adapted to register with the nuts and hold an interposed clampingplate againstthe underlying printing plate, have long been used inthe-printers art: and the Wescl device before referred to embodiesspecific forms of such clamping plate and nut, having consider ableutility, but inadequate in two respects, namely, the nut being hiddenfrom view when the printing plate is placed upon the supporting-bloclr,it was diflicult to cause the screw to find the screwtlireaded hole inthe nut and thread therewith, and also in that dc vice no means wereprovided to secure the nut in locked position and prevent it returninginto unlocked position; the tendency of the heavypross rollers pass ingover the printing-plate clamped on the block, straining and frequentlyloosening the clamping means. My invention consists in providing BIC31h, in such a device, to overcome these defects, and hence consists inthe combination with a snpportingblock having a series of parallelgrooves larger at the base than at top, preferably dove-tail in form,extending diagonally across the block, of a lock-nut somewhat less inthickness than the depth of the groove, slightly less in crosssectionthan the width of the groove at its base, and of a form in cross-sectionadapted to coincide with the vertical walls of the groove, and adaptedto enter and slide in the same, and of a suitable length preferablytwice that of its width, and having a central vertical screw-threadedslot through it: a clamping-plate of corresponding length approximately,with one or more of its longitudinal walls beveled and sufficiently wideto overlap the groove, and having a diagonally arranged shallow rib onits under face adapted to freely enter the groove in the block andoperate as a guide for the clamping plate, a central ve ticalcountersunk slot passing through it and extending through its said rib;and a locking screw having a threaded shank adapted to leg istcr withthe slot in the ribbed clamping-plate and with the screw-threaded slotin the lock-nut, and having a pointed end below its shank adapted toreach beyond the under face of the lock-nut when the parts are assembledand extend to and bear against the base of the groove in the supportingblock, and operate to force the bevel edges of the nut into coincidencewith the bevel walls of the groove in the supporting block.

In the accompanying drawings illustrating my invcntion:Figure l is aplan view of a portion of the grooved supporting block, and the clampingdevices holding the printing platc in position on the block, andconstituting the plate-holder; and Fig. 2 is a vertical section thereofon the line 2-2 of Fig. 1. Figs. 3 and 4 are plan views of a section ofthe block and cooperating clamping devices, the former showing thelocked and r the latter the unlocked position. Figs. 5 and 6 arevertical sectional views of the same parts, on lines 5 and 6 of Figs. 3and 4 respectively and also intended to illustrate the locked andunlocked positions; and Figs. 7, S and E) are respectively elevations ofthe screw, the clamping-plate and the loch-nut.

I; said rlmwings: indicates the usual supportingblocl; for a series oiprinting plates 2, and it is provided with itserics of parallel groovcs3 extending diagonally across the face of the block, at an angle ofabout fortytlve degrees. These grooves are wider at base than at top,and preferably of dovetail form in crossscction. 1n conjunction withsaid grooved block the plateclampiug device consists of a clamping plate4 which is flat oblong plate, rectangular in planular outline, with oneor more of its longitudinal edges 12 inwardly beveled, it is preferablyof it length itpproxlulfiltely twice its width and sufficiently wide tooverlap the groove 3 on both sid es and rest by its bevel edge on thereverse corresponding bevel edge of the interposed printing pin-to 2. Onits undo L 4 is provided with a iiko diagoizciiiyu-rrmigod shallow rib 5adapted to freely en 1110 q" vow 3 in the block 1, and operate. s aguide for the p 113d said plate l has :3. con ti'ztily counter-sunk opeL imrding thimigir it, and through the rib 5 on The eorow 7 has abeveled lic countersunk slot 6 in i he cl 8 is threaded as usual, but itthreaded shank with. an arch iorniancc of the functions her-e1 Tm:-stated. nut 10 is of a thickness somewhat? less than the depth of thegroove 3, of a wid'h to wit-.311. it to freely enter groove 3 lo theblock 1, our) 03 :1 k t. approxinmteiy twice its Width, and ha ing; 11cz-nmii vertical. screwthreaded siot 11 passing tlu i4; iiiolongitudinal edges 10 of s lock-nuturc 'ucw at when iiitezi in thegroove 3 they will. he: coin: part of the beveled walls f he be lockedagainst the same o-F Woo as held contact therewith.

Marginal piateimrs 14 are commoniy used to secure two sides of aprinting p ittcon {You supportmg-block. In such case 1 umwl those withtheir iong'k tudimm'l edges beveled as in cow of the clamping plate 4,also with ding mm ribs 5 on its uiuloriztce, and countersunk openingswith extended slots or plate 4, and. its shit-n1: nrovidod beyond the.(i point 9 for the peri The lockictionai 6 2.11 oponings-l see fig.E)-so toiat, when pieced in pooi tion in the grooves 33 of tho block itol-y may no clamped by employment therewith oi the screw and iock-nutelements omploycd with the clamping oiete and in like manner Thooperation of the device is an follows. The mar ginai plate-bars M, ifused be the block 1, and the pr iting plate being lined up against thesame by two oi its sidoa, a proper number of lock-nuts 1G are placed inthe grooves 3 of the block, Inovedup therein against the vertical planeof the edge oi the printing plate, then a dimming-plate over each of thesome, with its bevel edge over opping the roveree bevel edge of theprintinpioie, and the s'orew then applied as shown in Fig. 3 and turnedin; the direction shown in Fig. 5. The screw by its-long point findswith ease and certainty the slotted opening in the hidden iockuuxt andthe screw-Lhrcz'id therein; whoreupon a continuing turn of the SCXC-W,its point linds a 4 piacecl in the b33521 will of tho roovo 3 and theiocimiut posaibie for r 1 slump to become loose save by 3 to Myinvention, Sil'llli'JI as it is, has proved of great pmnticni utilitynot ou v in the saving of time of mm ployeos in mild up i0 s but in theprevei'ition oi the printing-pin Having thus fie iood my invention,when; 1 do as new and dcsirc to secure by Letters Patent is:

1. A. holder'ror priming-plows comprising i1 (liagon allyiporiinglilock.the grooves having a grc r dth 5': 131's w'n ii, and having itslongitudinal edges beveled, and be I slightly less in thickness than thed pi'h of said groove, and aduptcd-to fz'ocly outer said groove ml 3eherein, a, ciampingminto having one of its: lougiturl l edg s beveledand )mvidod oar its undoi'faco with a diagonally screw having; itsthreaded shank provided with an extended pointed o adapted to bearagainst the nasal wail of the groove in he support inguUCk when itsbeveled-head is brought into coincidence wlth the countersunk opening inthe sail clamping-plate, and operating to look the nut in the upperportion CfwSl'liil groove.

2. A holder for printing-plates comprising a supporting block havi. gparallel beveled grooves arranged at an an to the 's'of the block, alocl n\1t having its longitudinal edges beveled :it a correspondingangle. and adapt ed to freely enter and slide in sai'igroovos said nutbeing of greater length than width Purl slightly less in thickness thanthe depth of said grooves, .1 clumping-plate havingone or ooth 06 itslongitudinal edges inwardly beveled and provided on its underfaco with adiagonally-P igor} Shallow rib adapted to enter and guide the plate in tgroove of; the block, said plate having a countersunk slot extendingthrough it and its rm and a bevel-headed screw having its threaded shankprovided with an extended point of a role. this length adopted to hem1112mm the basal wail of the groove when the parts arc brought intoregister and llft the bowl edges of the nut into coincidence with rmbeveled wal a of the said groove in the supporting-block JULIUS WI-TEL.

.ViilltSScs' I becoming loose in the form.

than at top, a loclanui: 01' greater length ii an angerl rib, acountersunk oponingextonding through it amiyurough said .rib, and obevel-headed

